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Wireless Communications and Mobile Computing
Volume 2017, Article ID 3787089, 10 pages
Research Article

Why You Go Reveals Who You Know: Disclosing Social Relationship by Cooccurrence

1Beijing Key Laboratory of IOT Information Security, Institute of Information Engineering, CAS, Beijing 100093, China
2School of Cyber Security, University of Chinese Academy of Sciences, 19 A Yuquan Rd, Shijingshan District, Beijing 100049, China

Correspondence should be addressed to Hong Li;

Received 25 July 2017; Accepted 2 October 2017; Published 31 October 2017

Academic Editor: Chaokun Wang

Copyright © 2017 Feng Yi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The popularity of location-based services (LBS) and the ubiquity of sensor device have resulted in rich spatiotemporal data. A large number of human behaviors had been recorded including cooccurrence which refers to the phenomenon that two people have been to the same places at the same time. These data enable attackers to infer people’s social relationship based on their cooccurrences and many attack models were proposed. However, current attack models still cannot effectively address the following two challenges: How to distinguish cooccurrences between acquaintances and strangers? What kind of cooccurrence contributes to strong social strength? In this paper, we present a novel social relationship attack model—the Mobility Intention-based Relationship Inference (MIRI) model—which can solve the above two issues. Firstly, we extract mobility intentions and adopt them to characterize cooccurrences. A classification model is trained for attacking social relationship. The experimental results on two real-world datasets demonstrate that the proposed MIRI model can properly differentiate cooccurrences by simultaneously considering spatial and temporal features. The comparison results also indicate that MIRI model significantly outperforms state-of-the-art social relationship attack models.